Paper-creasing machine



(No Mddel.)

J. T. ROBINSON. PAPER GREASING MAGHINE.

No. 498,904. 'PaQtentedJuh'e 6, 1893.

249%. p c w Ln'ua. wasmncrou n c UNITED STATES PATENT OFFICE.

JOHN T. ROBINSON, 0F HYDE PARK, MASSACHUSETTS.

PAVPER-CREASING MACHINE.

SPECIFICATION forming part of Letters Patent No. 498,904, dated June 6, 1893.

Application filed May 31, 1892. Serial No. 434,864. (No model.)

T0 to whom it may concern.-

Be it known that I, JOHN T. ROBINSON, of Hyde Park, county of Norfolk, State of Massachusetts, have invented an Improvement in Paper-Oreasing Machines, of whichthe following description,in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

In the manufacture of paper boxes from paste-board it has been customary to crease the blank in the line in which the box, or it might be a box cover, was to be subsequently folded, but this crease has been made in but one direction. 7

In practice, it has been found that one creasing of the blank in a measure gives a permanent set to the paste-board, so that it does not so readily fold upon the line of the crease. In that class of boxes and covers employed to contain cigarettes and for other purposes, the cover when produced is made up as a tube which is cut into lengths suitable for each cigarette box cover, and the tubular section is then by edge pressure brought into parallelogrammic shape in cross section. In this class of covers it is a great desideratum to have the four side corners of the cover when righted into shape readily assume proper shape, and to do this I have discovered that the paper board or material from which the cover is made should be creased twice, the second crease being directly opposite to the first crease,but in the same longitudinal line. I have described such a box cover in another application filed by me, Serial No. 434,865, filed May 31, 1892.

This present invention relates to a machine for reverse-creasing paper.

The invention consists of a paper creasing machine comprising a series of blades and matching grooves therefor whereby a blank is creased on one side and afterward creased on the other side and directly opposite the first crease, so that the creases lie back to back substantially as I will proceed now to set forth in detail and finally claim.

Figure 1 in side elevation represents a sufficient portion of a creasing machine to enable my invention to be understood; Fig. 2, a partial section to the left of the line 00 Fig. 1; and Fig. 3, a partial section to the left of the line w.

Referring to the drawings, A represents a portion of asuitable bed-plate upon which are mounted suitable bearing or pillow blocks A, but one shown.

The shaft B, will in practice be rotated from some suitable source, and through its pinion B and the pinionsB B fast respectively on the feed rollers B B will rotate the said feed rolls. The pinion B engages a toothed gear 0 fast on the end of the shaft 0' and by its engagement with rotates a toothed gear C fast on the shaft 0 both of said shafts being in practice mounted in suitable bearing blocks controlled by an adjusting screw as C of usual construction.

The shaft 0' has surrounding it a series of collars Ct between which is arranged a series of carriers having blades a made as rings, the edges of the said blades coming opposite to and cooperating with annular grooves a made in rings a suitably applied to the shaft 0 there being a series of rings a separated by suitable collars a*. The gear 0 through an intermediate gear C engages a gear D fast on a shaft D, the gear D in engagement with a gear D fast on a shaft D causing the said shafts D and D to be rotated in unison. The shaft D has a series of rings (1 provided with annular grooves d, the said rings being separated by collars cl and the shaft D has a series of carriers (1 provided with creasing blades 61 having annular peripheries, said rings being arranged in sets and properly separated by collars d I have shown the gear O as engaging an intermediate gear 6 on a stud c, said intermediate through gears e and 6 serving to rotate a second pair of feed rolls e e and I have arranged back of the shafts D and D a third set of feed rolls which derive their movement of rotation from the gear D through the intermediate pinion f and the pinionsfflf It will be noticed as herein represented, that the first pair of shafts O, C have the creasing mechanism carried by them so arranged that the blades a are at the under side of the cardboard, which it is supposed that the feeding rolls are moving through the machine; but the set of blades 01 co-operating with the roll D are arranged above the said line of movement of the card board, so

that in practice the card-board is creased from its lower side upwardly, and then immediately afterward from its upper side downwardly, the main and reverse creases being in substantially the same line. Creasing the card-board reversely in the manner described, softens it at that point and leaves the cardboard very pliable, but yet not broken, so that the card-board will readily and quickly respond to pressure and bend at the desired creased lines, forming uniform side corners. This double creasing of the blanks is also found to materially cheapen the subsequent steps in the production of covers, such as referred to, and very considerable handling of blanks in order to get them into their parallelogrammic shape is obviated. The shafts C, 0 D, D are also provided at suitable intervals with slitting cutters h, h, which in 20 practice slit the paper longitudinally to make strips of the width desired for the strips to be made into tube form.

The rolls may have applied to them any desired number of sets of creasing rolls and slitting rolls.

Having described my invention, What I claim as new, and desire to secure by Letters Patent, is

A paper creasing machine comprising a series of creasing devices, one series of which act to crease the paper on one side, and the other to crease it on the other side, the creases lying back to back, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN T. ROBINSON.

Witnesses;

G O. W. GREGORY, EMMA J. BENNETT. 

